/*
 * Copyright (c) 2008-2012 Java Scene Graph
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'Java Scene Graph' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package trb.jsg.renderer;

import java.util.concurrent.ConcurrentLinkedQueue;
import trb.jsg.*;

/**
 * The Renderer can render a SceneGraph
 * 
 * @author tombr
 *
 */
public class Renderer {
	
	/** The current frame index */
	public static int frameIdx = 0;
    private static ConcurrentLinkedQueue<Runnable> runnables = new ConcurrentLinkedQueue();

    public static void invokeLater(Runnable runnable) {
        runnables.add(runnable);
    }
	
	private RetainedSceneGraph retainedSceneGraph = null;

	/**
	 * Constructs a Renderer that will render the specified scenegraph.
	 * @param sceneGraph the scenegraph to render
	 */
	public Renderer(SceneGraph sceneGraph) {
		retainedSceneGraph = new RetainedSceneGraph(sceneGraph);
	}
	
	/**
	 * Renders the scenegraph.
	 */
	public void render() {
        Runnable runnable = null;
        while ((runnable = runnables.poll()) != null) {
            runnable.run();
        }

		retainedSceneGraph.sceneGraph.updateTrees();
		retainedSceneGraph.render();
		frameIdx++;
	}
}
